DENVER (AP) -- There will be more whole grains on school lunch menus this year, along with a wider selection of fruits and vegetables and other healthy options. The challenge is getting children to eat them.

At a School Nutrition Association conference in Denver this summer, food workers heard tips about how to get children to make healthy food choices in the cafeteria.

The problem is a serious one for the nation's lunch-line managers, who are implementing the biggest update to federal school-food guidelines in 15 years.

New Department of Agriculture guidelines set calorie and sodium limits for school meals. Schools must offer dark green vegetables, orange or red vegetables and legumes at least once a week. Flavored milk must be nonfat, and there's a ban on artificial, artery-clogging trans fats.

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